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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec821ad7fab949f2df292c8a597ecf8d59fe44fe9c8e2a90662fcb133c1fe58' 
  AND token = 'hbt92fEPmmnoJru14X1cOc+TlFiBYeAjzMARZ+/BhGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}